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code_architecture.md

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Code Architecture

The entire code is written keeping interfaces in mind and not the implementations.

  • This will allow us to swap out different implementations
  • Factories are used to plug in the implementations

Interfaces

  • CacheInterface
    • Basic operations & attributes supported by a cache
  • CacheItemInterface
    • Basic operations & attributes supported by a cache item
  • EvictionPolicyInterface
    • Basic operations & attributes supported by a it
  • CacheFactoryInterface
  • SubscriberInterface
    • Commit log subscriber interface
  • PublisherInterface
    • Commit log subscriber interface
  • EventInterface, EventQueueInterface

Components

  • CacheManager is the component, with which the view interacts

    • It creates a new cache via factory
    • Plugs in the eviction policy
    • New cache and policy can be plugged in from here

  • Replication worker

    • Subscribes to the commit log and updates the server cache via localhost API call
    • A new commit log can be plugged in here

  • KafkaPublisher, KafkaSubscriber

    • Used to publish and subscribe from the commit log
    • A new commit log other than Kafka can be added which adheres to the interface

  • Event, CacheEvent, EventQueue

  • CacheEventObserver

    • Listens for a new event in the queue and publishes to commit log
    • A new commit log can be plugged in here